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AWS Lambda-backed Custom Resources

When you associate a Lambda function with a custom resource, the function is invoked
whenever the custom resource is created, updated, or deleted.
AWS CloudFormation calls a Lambda API to invoke the function and to pass all the request
data (such as the
request type and resource properties) to the function. The power and customizability
of
Lambda functions in combination with AWS CloudFormation enable a wide range of scenarios,
such as
dynamically looking up AMI IDs during stack creation, or implementing and using utility
functions, such as string reversal functions.